Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

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Feeding ecology of the subantarctic sea star <i>Anasterias minuta</i> within tide pools in Patagonia, Argentina
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Palabras clave

Anasterias
Patagonia
Feeding ecology
Perumytilus
Intertidal
Anasterias
Patagonia
Alimentación
Perumytilus
Intermareal

Cómo citar

Gil, D. G., & Zaixso, H. E. (2008). Feeding ecology of the subantarctic sea star <i>Anasterias minuta</i> within tide pools in Patagonia, Argentina. Revista De Biología Tropical, 56(S3), 311–328. https://doi.org/10.15517/rbt.v56i3.27147

Resumen

Se estudió la ecología trófica de la estrella de mar incubadora Anasterias minuta en ambientes de pozas intermareales en el centro y sur de Patagonia. Para tal fin, se realizaron un total de 8 470 observaciones de individuos. A. minuta no se alimenta mientras incuba y consume una gran diversidad de presas, como moluscos y crustáceos, y puede definirse como una especie depredadora oportunista o generalista. El mejillín Perumytilus purpuratus fue la presa mas frecuente (57.6%). Otras presas importantes fueron el gasterópodo Pareuthria plumbea, el isópodo Exosphaeroma lanceolatum y los mitílidos Aulacomya atra atra y Mytilus edulis platensis. La proporción de estrellas de mar que se alimenta de presas sésiles aumenta con el tamaño de la estrella. Se encontró una correlación significativamente positiva entre el tamaño de la estrella y el tamaño de las presas mas frecuentes. La dieta no cambio a lo largo del año, pero su composición difirió entre los sitios, los horizontes intermareales, y el tamaño de la estrella. Se encontró una mayor diversidad de presas consumidas en el infralitoral de la costa semi expuesta de Caleta Cordova Norte, durante la estación templada. A. minuta podría ser considerada oportunista al consumir mitílidos sueltos, desprendidos por las olas y acumulados en las pozas intermareales cuando están disponibles, por consecuencia, podría tener un impacto variable en la estructura de las comunidades intermareales patagónicas.
https://doi.org/10.15517/rbt.v56i3.27147
PDF (English)

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